CVE-2006-1298 in Backup Exec
Summary
by MITRE
Format string vulnerability in the Job Engine service (bengine.exe) in the Media Server in Veritas Backup Exec 10d (10.1) for Windows Servers rev. 5629, Backup Exec 10.0 for Windows Servers rev. 5520, Backup Exec 10.0 for Windows Servers rev. 5484, and Backup Exec 9.1 for Windows Servers rev. 4691, when the job log mode is Full Detailed (aka Full Details), allows remote authenticated users to cause a denial of service and possibly execute arbitrary code via a crafted filename on a machine that is backed up by Backup Exec.
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Analysis
by VulDB Data Team • 09/02/2019
The vulnerability identified as CVE-2006-1298 represents a critical format string flaw within the Job Engine service component of Veritas Backup Exec software versions 9.1 through 10.1. This issue specifically affects Windows Server environments and manifests when the backup job log mode is configured to Full Detailed or Full Details. The vulnerability resides in the bengine.exe process which serves as the core job execution engine for backup operations, making it a prime target for exploitation within backup infrastructure environments. The flaw occurs during the processing of filenames in backup operations, where insufficient input validation allows maliciously crafted strings to be interpreted as format specifiers rather than literal text.
The technical implementation of this vulnerability stems from improper handling of user-supplied data within the logging and filename processing functions of the Backup Exec Job Engine. When backup operations are performed with Full Detailed logging enabled, the system processes backup filenames through a vulnerable string formatting function that does not properly sanitize input parameters. This creates an opportunity for attackers to inject format specifiers such as %s, %d, or %x into the filename field, which then get interpreted by the vulnerable logging mechanism. The flaw aligns with CWE-134, which specifically addresses format string vulnerabilities where format strings are constructed from user-controlled data without proper validation or sanitization. This weakness enables attackers to manipulate memory locations and potentially execute arbitrary code through carefully crafted input sequences.
The operational impact of this vulnerability extends beyond simple denial of service conditions to include potential code execution capabilities that could severely compromise backup infrastructure integrity. Remote authenticated users with access to the backup system can exploit this vulnerability to cause system crashes, leading to service disruption and backup job failures. More critically, the vulnerability could allow attackers to execute arbitrary code with the privileges of the Backup Exec service account, potentially providing access to sensitive backup data or enabling lateral movement within the network. The attack vector requires authentication to the backup system, but once authenticated, an attacker can leverage this weakness to cause significant operational damage. This vulnerability particularly affects enterprise environments where backup systems are critical infrastructure components, making it a high-priority target for attackers seeking to disrupt business continuity operations. The vulnerability also maps to ATT&CK technique T1059.007 for command and scripting interpreter, as successful exploitation could enable attackers to execute malicious code through the compromised backup service.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security posture improvements. The primary solution involves applying the vendor-provided patches and updates released by Veritas to address the format string vulnerability in the affected Backup Exec versions. Organizations should immediately upgrade to patched versions of Backup Exec 10.1, 10.0, and 9.1 to eliminate the vulnerability exposure. Additionally, implementing network segmentation and access controls can limit the attack surface by restricting unauthorized access to backup systems. The configuration should be reviewed to disable unnecessary logging modes and implement proper input validation for all user-supplied data in backup operations. Security monitoring should be enhanced to detect anomalous backup job behavior or unusual logging patterns that might indicate exploitation attempts. Regular security assessments of backup infrastructure should be conducted to identify and remediate similar vulnerabilities in other backup and recovery systems. System administrators should also implement principle of least privilege for backup service accounts and ensure that backup operations are performed with minimal required permissions to reduce the impact of potential exploitation. The vulnerability demonstrates the importance of proper input validation in security-critical applications and highlights the need for regular security testing of enterprise backup infrastructure components.